21-11-2020 23:06
21-11-2020 23:09
Have you followed the info in this guide?
Guide: Unlocking an O2 phone to use a different SIM card
Veritas Numquam Perit
21-11-2020 23:12 - edited 21-11-2020 23:54
21-11-2020 23:12 - edited 21-11-2020 23:54
Also checking if you are sure your phone IS actually locked? O2 have been selling their phones unlocked since July 2018. You could test this by using a non O2 sim in your phone to check.
Edied to correct info
Veritas Numquam Perit
21-11-2020 23:15
22-11-2020 00:00
22-11-2020 00:00
You need to use the old sim in your phone to unlock it. Once unlocked you can then insert the new sim into the phone.
The easiest way is by using the link found in your MyO2 Unlock (this assumes that it is the current phone you are using is the one you want to unlock)
Veritas Numquam Perit
22-11-2020 00:03
22-11-2020 00:03
What phone and what is the actual error message?